A few weeks after the October 2 incident, Saudi had accepted the fact that the group of 15 Saudi agents were behind the murder of the former Washington Post journalist, leading to an worldwide furore and complicating the already delicate relations between Saudi, Turkey and the US.
According to the statement, the Istanbul chief prosecutor reiterated a call for the extradition of the suspects arrested in Saudi Arabia, saying "Turkish courts have jurisdiction over the case in line with Turkish law and principles of global law, provided that Jamal Khashoggi was killed in Turkey".
Turkey is also calling for Saudi Arabia to reveal where the location of Khashoggi's body, with Riyadh claiming a local disposed of his remains.
Turkish officials have said that a Saudi team of 15 men tortured, killed and dismembered the writer in a premeditated act.
In a sign of the pressure on the Saudi leadership to change course, top USA officials on Wednesday demanded peace talks within a month to end the Yemen conflict.
He has met with Istanbul's chief prosecutor Irfan Fidan twice, and inspected the Saudi consulate.
"The Saudi officials seemed primarily interested in finding out what evidence the Turkish authorities had against the perpetrators", the official told AFP on the condition of anonymity.
The announcement came as Mr al-Mojeb ended a three-day visit to Istanbul during which he held talks with Mr Fidan and other Turkish officials.
Saudi Arabia has not commented on the prosecutor's visit, and the White House did not immediately respond to a request for comment from The Post.
Khashoggi, who had become a frequent critic of the crown prince of Saudi Arabia, was in the consulate to obtain papers for his planned marriage.
Under mounting pressure, Saudi Arabia changed its narrative about Khashoggi's killing several times, eventually admitting Khashoggi died inside the consulate.